eop root element for SAR Earth Observation Product description.Namespace for SAR products EarthObservationProduct. This is a first minimum set suggested by DLR. The configuration of EOWEB User Services for TerraSAR-X is ongoing as well as the definition of Feature applicable to catalogue services. Sources: DLR TerraSAR-X PGS SAR L1B Archive Product Specification, SAR Raw Exchange Product Specification single S, dual D, twin T, quad Q, UNDEFINED Polarisation channel transmit/receive configuration: horizontal, vertical. Polarisation channel transmit/receive configuration: horizontal, vertical. Minimum Incidence angle. Maximum Incidence angle. Incidence angle variation Doppler Frequency of acquisition.